https://learn.microsoft.com/cs-cz/dotnet/api/system.windows.data.collectionview.deferrefresh?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
CollectionView.DeferRefresh Method (System.Windows.Data) | Microsoft Learn
Enters a defer cycle that you can use to merge changes to the view and delay automatic refresh.
methodsystemwindowsdatamicrosoft